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                    类型
            
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                    常量
            
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                    Slice
            
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                    Map
            
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                    结构体
            
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                    JSON
            
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                    文本和HTML模板
            
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                    函数
            
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                    函数声明
            
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                    递归
            
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                    多返回值
            
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                    函数值
            
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                    匿名函数
            
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                    可变参数
            
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                    Deferred函数
            
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                    Panic异常
            
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                    Recover捕获异常
            
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                    方法
            
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                    方法声明
            
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                    基于指针对象的方法
            
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                    通过嵌入结构体来扩展类型
            
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                    方法值和方法表达式
            
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                    示例: Bit数组
            
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                    封装
            
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                    接口
            
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                    接口是合约
            
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        <li class="chapter " data-level="1.8.2" data-path="../ch7/ch7-02.html">
            
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                    接口类型
            
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                    实现接口的条件
            
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        <li class="chapter " data-level="1.8.4" data-path="../ch7/ch7-04.html">
            
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                    flag.Value接口
            
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                    接口值
            
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        <li class="chapter " data-level="1.8.6" data-path="../ch7/ch7-06.html">
            
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                    sort.Interface接口
            
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        <li class="chapter " data-level="1.8.7" data-path="../ch7/ch7-07.html">
            
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                    http.Handler接口
            
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                    error接口
            
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                    示例: 表达式求值
            
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        <li class="chapter " data-level="1.8.10" data-path="../ch7/ch7-10.html">
            
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                    类型断言
            
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        <li class="chapter " data-level="1.8.11" data-path="../ch7/ch7-11.html">
            
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                    基于类型断言识别错误类型
            
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        <li class="chapter " data-level="1.8.12" data-path="../ch7/ch7-12.html">
            
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                    通过类型断言查询接口
            
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        <li class="chapter " data-level="1.8.13" data-path="../ch7/ch7-13.html">
            
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                    类型分支
            
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                    示例: 基于标记的XML解码
            
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        <li class="chapter " data-level="1.8.15" data-path="../ch7/ch7-15.html">
            
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                    补充几点
            
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        <li class="chapter " data-level="1.9" data-path="../ch8/ch8.html">
            
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                    Goroutines和Channels
            
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                    Goroutines
            
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        <li class="chapter " data-level="1.9.2" data-path="../ch8/ch8-02.html">
            
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                    示例: 并发的Clock服务
            
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        <li class="chapter " data-level="1.9.3" data-path="../ch8/ch8-03.html">
            
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                    示例: 并发的Echo服务
            
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        <li class="chapter " data-level="1.9.4" data-path="../ch8/ch8-04.html">
            
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                    Channels
            
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        <li class="chapter " data-level="1.9.5" data-path="../ch8/ch8-05.html">
            
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                    并发的循环
            
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        <li class="chapter " data-level="1.9.6" data-path="../ch8/ch8-06.html">
            
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                    示例: 并发的Web爬虫
            
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        <li class="chapter " data-level="1.9.7" data-path="../ch8/ch8-07.html">
            
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                    基于select的多路复用
            
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        <li class="chapter " data-level="1.9.8" data-path="../ch8/ch8-08.html">
            
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                    示例: 并发的目录遍历
            
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        <li class="chapter " data-level="1.9.9" data-path="../ch8/ch8-09.html">
            
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                    并发的退出
            
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        <li class="chapter " data-level="1.9.10" data-path="../ch8/ch8-10.html">
            
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                    示例: 聊天服务
            
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        <li class="chapter " data-level="1.10" data-path="../ch9/ch9.html">
            
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                    基于共享变量的并发
            
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        <li class="chapter " data-level="1.10.1" data-path="../ch9/ch9-01.html">
            
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                    竞争条件
            
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        <li class="chapter " data-level="1.10.2" data-path="../ch9/ch9-02.html">
            
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                    sync.Mutex互斥锁
            
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        <li class="chapter " data-level="1.10.3" data-path="../ch9/ch9-03.html">
            
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                    sync.RWMutex读写锁
            
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        <li class="chapter " data-level="1.10.4" data-path="../ch9/ch9-04.html">
            
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                    内存同步
            
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        <li class="chapter " data-level="1.10.5" data-path="../ch9/ch9-05.html">
            
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                    sync.Once惰性初始化
            
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        <li class="chapter " data-level="1.10.6" data-path="../ch9/ch9-06.html">
            
                <a href="../ch9/ch9-06.html">
            
                    
                    竞争条件检测
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.7" data-path="../ch9/ch9-07.html">
            
                <a href="../ch9/ch9-07.html">
            
                    
                    示例: 并发的非阻塞缓存
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.8" data-path="../ch9/ch9-08.html">
            
                <a href="../ch9/ch9-08.html">
            
                    
                    Goroutines和线程
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.11" data-path="ch10.html">
            
                <a href="ch10.html">
            
                    
                    包和工具
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.11.1" data-path="ch10-01.html">
            
                <a href="ch10-01.html">
            
                    
                    包简介
            
                </a>
            

            
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        <li class="chapter " data-level="1.11.2" data-path="ch10-02.html">
            
                <a href="ch10-02.html">
            
                    
                    导入路径
            
                </a>
            

            
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        <li class="chapter " data-level="1.11.3" data-path="ch10-03.html">
            
                <a href="ch10-03.html">
            
                    
                    包声明
            
                </a>
            

            
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        <li class="chapter " data-level="1.11.4" data-path="ch10-04.html">
            
                <a href="ch10-04.html">
            
                    
                    导入声明
            
                </a>
            

            
        </li>
    
        <li class="chapter active" data-level="1.11.5" data-path="ch10-05.html">
            
                <a href="ch10-05.html">
            
                    
                    包的匿名导入
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.6" data-path="ch10-06.html">
            
                <a href="ch10-06.html">
            
                    
                    包和命名
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.7" data-path="ch10-07.html">
            
                <a href="ch10-07.html">
            
                    
                    工具
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.12" data-path="../ch11/ch11.html">
            
                <a href="../ch11/ch11.html">
            
                    
                    测试
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.12.1" data-path="../ch11/ch11-01.html">
            
                <a href="../ch11/ch11-01.html">
            
                    
                    go test
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.2" data-path="../ch11/ch11-02.html">
            
                <a href="../ch11/ch11-02.html">
            
                    
                    测试函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.3" data-path="../ch11/ch11-03.html">
            
                <a href="../ch11/ch11-03.html">
            
                    
                    测试覆盖率
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.4" data-path="../ch11/ch11-04.html">
            
                <a href="../ch11/ch11-04.html">
            
                    
                    基准测试
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.5" data-path="../ch11/ch11-05.html">
            
                <a href="../ch11/ch11-05.html">
            
                    
                    剖析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.6" data-path="../ch11/ch11-06.html">
            
                <a href="../ch11/ch11-06.html">
            
                    
                    示例函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.13" data-path="../ch12/ch12.html">
            
                <a href="../ch12/ch12.html">
            
                    
                    反射
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.13.1" data-path="../ch12/ch12-01.html">
            
                <a href="../ch12/ch12-01.html">
            
                    
                    为何需要反射?
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.2" data-path="../ch12/ch12-02.html">
            
                <a href="../ch12/ch12-02.html">
            
                    
                    reflect.Type和reflect.Value
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.3" data-path="../ch12/ch12-03.html">
            
                <a href="../ch12/ch12-03.html">
            
                    
                    Display递归打印
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.4" data-path="../ch12/ch12-04.html">
            
                <a href="../ch12/ch12-04.html">
            
                    
                    示例: 编码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.5" data-path="../ch12/ch12-05.html">
            
                <a href="../ch12/ch12-05.html">
            
                    
                    通过reflect.Value修改值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.6" data-path="../ch12/ch12-06.html">
            
                <a href="../ch12/ch12-06.html">
            
                    
                    示例: 解码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.7" data-path="../ch12/ch12-07.html">
            
                <a href="../ch12/ch12-07.html">
            
                    
                    获取结构体字段标签
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.8" data-path="../ch12/ch12-08.html">
            
                <a href="../ch12/ch12-08.html">
            
                    
                    显示一个类型的方法集
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.9" data-path="../ch12/ch12-09.html">
            
                <a href="../ch12/ch12-09.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.14" data-path="../ch13/ch13.html">
            
                <a href="../ch13/ch13.html">
            
                    
                    底层编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.14.1" data-path="../ch13/ch13-01.html">
            
                <a href="../ch13/ch13-01.html">
            
                    
                    unsafe.Sizeof, Alignof 和 Offsetof
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.2" data-path="../ch13/ch13-02.html">
            
                <a href="../ch13/ch13-02.html">
            
                    
                    unsafe.Pointer
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.3" data-path="../ch13/ch13-03.html">
            
                <a href="../ch13/ch13-03.html">
            
                    
                    示例: 深度相等判断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.4" data-path="../ch13/ch13-04.html">
            
                <a href="../ch13/ch13-04.html">
            
                    
                    通过cgo调用C代码
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.5" data-path="../ch13/ch13-05.html">
            
                <a href="../ch13/ch13-05.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
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                    附录
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.15.1" data-path="../appendix/appendix-a-errata.html">
            
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                    附录A：原文勘误
            
                </a>
            

            
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                    附录B：作者译者
            
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                    附录C：译文授权
            
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                    附录D：其它语言
            
                </a>
            

            
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                                <h2 id="105-&#x5305;&#x7684;&#x533F;&#x540D;&#x5BFC;&#x5165;">10.5. &#x5305;&#x7684;&#x533F;&#x540D;&#x5BFC;&#x5165;</h2>
<p>&#x5982;&#x679C;&#x53EA;&#x662F;&#x5BFC;&#x5165;&#x4E00;&#x4E2A;&#x5305;&#x800C;&#x5E76;&#x4E0D;&#x4F7F;&#x7528;&#x5BFC;&#x5165;&#x7684;&#x5305;&#x5C06;&#x4F1A;&#x5BFC;&#x81F4;&#x4E00;&#x4E2A;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#x3002;&#x4F46;&#x662F;&#x6709;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x53EA;&#x662F;&#x60F3;&#x5229;&#x7528;&#x5BFC;&#x5165;&#x5305;&#x800C;&#x4EA7;&#x751F;&#x7684;&#x526F;&#x4F5C;&#x7528;&#xFF1A;&#x5B83;&#x4F1A;&#x8BA1;&#x7B97;&#x5305;&#x7EA7;&#x53D8;&#x91CF;&#x7684;&#x521D;&#x59CB;&#x5316;&#x8868;&#x8FBE;&#x5F0F;&#x548C;&#x6267;&#x884C;&#x5BFC;&#x5165;&#x5305;&#x7684;init&#x521D;&#x59CB;&#x5316;&#x51FD;&#x6570;&#xFF08;&#xA7;2.6.2&#xFF09;&#x3002;&#x8FD9;&#x65F6;&#x5019;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x6291;&#x5236;&#x201C;unused import&#x201D;&#x7F16;&#x8BD1;&#x9519;&#x8BEF;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x7528;&#x4E0B;&#x5212;&#x7EBF;<code>_</code>&#x6765;&#x91CD;&#x547D;&#x540D;&#x5BFC;&#x5165;&#x7684;&#x5305;&#x3002;&#x50CF;&#x5F80;&#x5E38;&#x4E00;&#x6837;&#xFF0C;&#x4E0B;&#x5212;&#x7EBF;<code>_</code>&#x4E3A;&#x7A7A;&#x767D;&#x6807;&#x8BC6;&#x7B26;&#xFF0C;&#x5E76;&#x4E0D;&#x80FD;&#x88AB;&#x8BBF;&#x95EE;&#x3002;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">import</span> _ <span class="hljs-string">&quot;image/png&quot;</span> <span class="hljs-comment">// register PNG decoder</span>
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x88AB;&#x79F0;&#x4E3A;&#x5305;&#x7684;&#x533F;&#x540D;&#x5BFC;&#x5165;&#x3002;&#x5B83;&#x901A;&#x5E38;&#x662F;&#x7528;&#x6765;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A;&#x7F16;&#x8BD1;&#x65F6;&#x673A;&#x5236;&#xFF0C;&#x7136;&#x540E;&#x901A;&#x8FC7;&#x5728;main&#x4E3B;&#x7A0B;&#x5E8F;&#x5165;&#x53E3;&#x9009;&#x62E9;&#x6027;&#x5730;&#x5BFC;&#x5165;&#x9644;&#x52A0;&#x7684;&#x5305;&#x3002;&#x9996;&#x5148;&#xFF0C;&#x8BA9;&#x6211;&#x4EEC;&#x770B;&#x770B;&#x5982;&#x4F55;&#x4F7F;&#x7528;&#x8BE5;&#x7279;&#x6027;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x770B;&#x770B;&#x5B83;&#x662F;&#x5982;&#x4F55;&#x5DE5;&#x4F5C;&#x7684;&#x3002;</p>
<p>&#x6807;&#x51C6;&#x5E93;&#x7684;image&#x56FE;&#x50CF;&#x5305;&#x5305;&#x542B;&#x4E86;&#x4E00;&#x4E2A;<code>Decode</code>&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x4E8E;&#x4ECE;<code>io.Reader</code>&#x63A5;&#x53E3;&#x8BFB;&#x53D6;&#x6570;&#x636E;&#x5E76;&#x89E3;&#x7801;&#x56FE;&#x50CF;&#xFF0C;&#x5B83;&#x8C03;&#x7528;&#x5E95;&#x5C42;&#x6CE8;&#x518C;&#x7684;&#x56FE;&#x50CF;&#x89E3;&#x7801;&#x5668;&#x6765;&#x5B8C;&#x6210;&#x4EFB;&#x52A1;&#xFF0C;&#x7136;&#x540E;&#x8FD4;&#x56DE;image.Image&#x7C7B;&#x578B;&#x7684;&#x56FE;&#x50CF;&#x3002;&#x4F7F;&#x7528;<code>image.Decode</code>&#x5F88;&#x5BB9;&#x6613;&#x7F16;&#x5199;&#x4E00;&#x4E2A;&#x56FE;&#x50CF;&#x683C;&#x5F0F;&#x7684;&#x8F6C;&#x6362;&#x5DE5;&#x5177;&#xFF0C;&#x8BFB;&#x53D6;&#x4E00;&#x79CD;&#x683C;&#x5F0F;&#x7684;&#x56FE;&#x50CF;&#xFF0C;&#x7136;&#x540E;&#x7F16;&#x7801;&#x4E3A;&#x53E6;&#x4E00;&#x79CD;&#x56FE;&#x50CF;&#x683C;&#x5F0F;&#xFF1A;</p>
<p><u><i>gopl.io/ch10/jpeg</i></u></p>
<pre><code class="lang-Go"><span class="hljs-comment">// The jpeg command reads a PNG image from the standard input</span>
<span class="hljs-comment">// and writes it as a JPEG image to the standard output.</span>
<span class="hljs-keyword">package</span> main

<span class="hljs-keyword">import</span> (
    <span class="hljs-string">&quot;fmt&quot;</span>
    <span class="hljs-string">&quot;image&quot;</span>
    <span class="hljs-string">&quot;image/jpeg&quot;</span>
    _ <span class="hljs-string">&quot;image/png&quot;</span> <span class="hljs-comment">// register PNG decoder</span>
    <span class="hljs-string">&quot;io&quot;</span>
    <span class="hljs-string">&quot;os&quot;</span>
)

<span class="hljs-keyword">func</span> main() {
    <span class="hljs-keyword">if</span> err := toJPEG(os.Stdin, os.Stdout); err != <span class="hljs-literal">nil</span> {
        fmt.Fprintf(os.Stderr, <span class="hljs-string">&quot;jpeg: %v\n&quot;</span>, err)
        os.Exit(<span class="hljs-number">1</span>)
    }
}

<span class="hljs-keyword">func</span> toJPEG(in io.Reader, out io.Writer) error {
    img, kind, err := image.Decode(in)
    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
        <span class="hljs-keyword">return</span> err
    }
    fmt.Fprintln(os.Stderr, <span class="hljs-string">&quot;Input format =&quot;</span>, kind)
    <span class="hljs-keyword">return</span> jpeg.Encode(out, img, &amp;jpeg.Options{Quality: <span class="hljs-number">95</span>})
}
</code></pre>
<p>&#x5982;&#x679C;&#x6211;&#x4EEC;&#x5C06;<code>gopl.io/ch3/mandelbrot</code>&#xFF08;&#xA7;3.3&#xFF09;&#x7684;&#x8F93;&#x51FA;&#x5BFC;&#x5165;&#x5230;&#x8FD9;&#x4E2A;&#x7A0B;&#x5E8F;&#x7684;&#x6807;&#x51C6;&#x8F93;&#x5165;&#xFF0C;&#x5B83;&#x5C06;&#x89E3;&#x7801;&#x8F93;&#x5165;&#x7684;PNG&#x683C;&#x5F0F;&#x56FE;&#x50CF;&#xFF0C;&#x7136;&#x540E;&#x8F6C;&#x6362;&#x4E3A;JPEG&#x683C;&#x5F0F;&#x7684;&#x56FE;&#x50CF;&#x8F93;&#x51FA;&#xFF08;&#x56FE;3.3&#xFF09;&#x3002;</p>
<pre><code>$ go build gopl.io/ch3/mandelbrot
$ go build gopl.io/ch10/jpeg
$ ./mandelbrot | ./jpeg &gt;mandelbrot.jpg
Input format = png
</code></pre><p>&#x8981;&#x6CE8;&#x610F;image/png&#x5305;&#x7684;&#x533F;&#x540D;&#x5BFC;&#x5165;&#x8BED;&#x53E5;&#x3002;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x8FD9;&#x4E00;&#x884C;&#x8BED;&#x53E5;&#xFF0C;&#x7A0B;&#x5E8F;&#x4F9D;&#x7136;&#x53EF;&#x4EE5;&#x7F16;&#x8BD1;&#x548C;&#x8FD0;&#x884C;&#xFF0C;&#x4F46;&#x662F;&#x5B83;&#x5C06;&#x4E0D;&#x80FD;&#x6B63;&#x786E;&#x8BC6;&#x522B;&#x548C;&#x89E3;&#x7801;PNG&#x683C;&#x5F0F;&#x7684;&#x56FE;&#x50CF;&#xFF1A;</p>
<pre><code>$ go build gopl.io/ch10/jpeg
$ ./mandelbrot | ./jpeg &gt;mandelbrot.jpg
jpeg: image: unknown format
</code></pre><p>&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x6F14;&#x793A;&#x4E86;&#x5B83;&#x7684;&#x5DE5;&#x4F5C;&#x673A;&#x5236;&#x3002;&#x6807;&#x51C6;&#x5E93;&#x8FD8;&#x63D0;&#x4F9B;&#x4E86;GIF&#x3001;PNG&#x548C;JPEG&#x7B49;&#x683C;&#x5F0F;&#x56FE;&#x50CF;&#x7684;&#x89E3;&#x7801;&#x5668;&#xFF0C;&#x7528;&#x6237;&#x4E5F;&#x53EF;&#x4EE5;&#x63D0;&#x4F9B;&#x81EA;&#x5DF1;&#x7684;&#x89E3;&#x7801;&#x5668;&#xFF0C;&#x4F46;&#x662F;&#x4E3A;&#x4E86;&#x4FDD;&#x6301;&#x7A0B;&#x5E8F;&#x4F53;&#x79EF;&#x8F83;&#x5C0F;&#xFF0C;&#x5F88;&#x591A;&#x89E3;&#x7801;&#x5668;&#x5E76;&#x6CA1;&#x6709;&#x88AB;&#x5168;&#x90E8;&#x5305;&#x542B;&#xFF0C;&#x9664;&#x975E;&#x662F;&#x660E;&#x786E;&#x9700;&#x8981;&#x652F;&#x6301;&#x7684;&#x683C;&#x5F0F;&#x3002;image.Decode&#x51FD;&#x6570;&#x5728;&#x89E3;&#x7801;&#x65F6;&#x4F1A;&#x4F9D;&#x6B21;&#x67E5;&#x8BE2;&#x652F;&#x6301;&#x7684;&#x683C;&#x5F0F;&#x5217;&#x8868;&#x3002;&#x6BCF;&#x4E2A;&#x683C;&#x5F0F;&#x9A71;&#x52A8;&#x5217;&#x8868;&#x7684;&#x6BCF;&#x4E2A;&#x5165;&#x53E3;&#x6307;&#x5B9A;&#x4E86;&#x56DB;&#x4EF6;&#x4E8B;&#x60C5;&#xFF1A;&#x683C;&#x5F0F;&#x7684;&#x540D;&#x79F0;&#xFF1B;&#x4E00;&#x4E2A;&#x7528;&#x4E8E;&#x63CF;&#x8FF0;&#x8FD9;&#x79CD;&#x56FE;&#x50CF;&#x6570;&#x636E;&#x5F00;&#x5934;&#x90E8;&#x5206;&#x6A21;&#x5F0F;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x7528;&#x4E8E;&#x89E3;&#x7801;&#x5668;&#x68C0;&#x6D4B;&#x8BC6;&#x522B;&#xFF1B;&#x4E00;&#x4E2A;Decode&#x51FD;&#x6570;&#x7528;&#x4E8E;&#x5B8C;&#x6210;&#x89E3;&#x7801;&#x56FE;&#x50CF;&#x5DE5;&#x4F5C;&#xFF1B;&#x4E00;&#x4E2A;DecodeConfig&#x51FD;&#x6570;&#x7528;&#x4E8E;&#x89E3;&#x7801;&#x56FE;&#x50CF;&#x7684;&#x5927;&#x5C0F;&#x548C;&#x989C;&#x8272;&#x7A7A;&#x95F4;&#x7684;&#x4FE1;&#x606F;&#x3002;&#x6BCF;&#x4E2A;&#x9A71;&#x52A8;&#x5165;&#x53E3;&#x662F;&#x901A;&#x8FC7;&#x8C03;&#x7528;image.RegisterFormat&#x51FD;&#x6570;&#x6CE8;&#x518C;&#xFF0C;&#x4E00;&#x822C;&#x662F;&#x5728;&#x6BCF;&#x4E2A;&#x683C;&#x5F0F;&#x5305;&#x7684;init&#x521D;&#x59CB;&#x5316;&#x51FD;&#x6570;&#x4E2D;&#x8C03;&#x7528;&#xFF0C;&#x4F8B;&#x5982;image/png&#x5305;&#x662F;&#x8FD9;&#x6837;&#x6CE8;&#x518C;&#x7684;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">package</span> png <span class="hljs-comment">// image/png</span>

<span class="hljs-keyword">func</span> Decode(r io.Reader) (image.Image, error)
<span class="hljs-keyword">func</span> DecodeConfig(r io.Reader) (image.Config, error)

<span class="hljs-keyword">func</span> init() {
    <span class="hljs-keyword">const</span> pngHeader = <span class="hljs-string">&quot;\x89PNG\r\n\x1a\n&quot;</span>
    image.RegisterFormat(<span class="hljs-string">&quot;png&quot;</span>, pngHeader, Decode, DecodeConfig)
}
</code></pre>
<p>&#x6700;&#x7EC8;&#x7684;&#x6548;&#x679C;&#x662F;&#xFF0C;&#x4E3B;&#x7A0B;&#x5E8F;&#x53EA;&#x9700;&#x8981;&#x533F;&#x540D;&#x5BFC;&#x5165;&#x7279;&#x5B9A;&#x56FE;&#x50CF;&#x9A71;&#x52A8;&#x5305;&#x5C31;&#x53EF;&#x4EE5;&#x7528;image.Decode&#x89E3;&#x7801;&#x5BF9;&#x5E94;&#x683C;&#x5F0F;&#x7684;&#x56FE;&#x50CF;&#x4E86;&#x3002;</p>
<p>&#x6570;&#x636E;&#x5E93;&#x5305;database/sql&#x4E5F;&#x662F;&#x91C7;&#x7528;&#x4E86;&#x7C7B;&#x4F3C;&#x7684;&#x6280;&#x672F;&#xFF0C;&#x8BA9;&#x7528;&#x6237;&#x53EF;&#x4EE5;&#x6839;&#x636E;&#x81EA;&#x5DF1;&#x9700;&#x8981;&#x9009;&#x62E9;&#x5BFC;&#x5165;&#x5FC5;&#x8981;&#x7684;&#x6570;&#x636E;&#x5E93;&#x9A71;&#x52A8;&#x3002;&#x4F8B;&#x5982;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">import</span> (
    <span class="hljs-string">&quot;database/sql&quot;</span>
    _ <span class="hljs-string">&quot;github.com/lib/pq&quot;</span>              <span class="hljs-comment">// enable support for Postgres</span>
    _ <span class="hljs-string">&quot;github.com/go-sql-driver/mysql&quot;</span> <span class="hljs-comment">// enable support for MySQL</span>
)

db, err = sql.Open(<span class="hljs-string">&quot;postgres&quot;</span>, dbname) <span class="hljs-comment">// OK</span>
db, err = sql.Open(<span class="hljs-string">&quot;mysql&quot;</span>, dbname)    <span class="hljs-comment">// OK</span>
db, err = sql.Open(<span class="hljs-string">&quot;sqlite3&quot;</span>, dbname)  <span class="hljs-comment">// returns error: unknown driver &quot;sqlite3&quot;</span>
</code></pre>
<p><strong>&#x7EC3;&#x4E60; 10.1&#xFF1A;</strong> &#x6269;&#x5C55;jpeg&#x7A0B;&#x5E8F;&#xFF0C;&#x4EE5;&#x652F;&#x6301;&#x4EFB;&#x610F;&#x56FE;&#x50CF;&#x683C;&#x5F0F;&#x4E4B;&#x95F4;&#x7684;&#x76F8;&#x4E92;&#x8F6C;&#x6362;&#xFF0C;&#x4F7F;&#x7528;image.Decode&#x68C0;&#x6D4B;&#x652F;&#x6301;&#x7684;&#x683C;&#x5F0F;&#x7C7B;&#x578B;&#xFF0C;&#x7136;&#x540E;&#x901A;&#x8FC7;flag&#x547D;&#x4EE4;&#x884C;&#x6807;&#x5FD7;&#x53C2;&#x6570;&#x9009;&#x62E9;&#x8F93;&#x51FA;&#x7684;&#x683C;&#x5F0F;&#x3002;</p>
<p><strong>&#x7EC3;&#x4E60; 10.2&#xFF1A;</strong> &#x8BBE;&#x8BA1;&#x4E00;&#x4E2A;&#x901A;&#x7528;&#x7684;&#x538B;&#x7F29;&#x6587;&#x4EF6;&#x8BFB;&#x53D6;&#x6846;&#x67B6;&#xFF0C;&#x7528;&#x6765;&#x8BFB;&#x53D6;ZIP&#xFF08;archive/zip&#xFF09;&#x548C;POSIX tar&#xFF08;archive/tar&#xFF09;&#x683C;&#x5F0F;&#x538B;&#x7F29;&#x7684;&#x6587;&#x6863;&#x3002;&#x4F7F;&#x7528;&#x7C7B;&#x4F3C;&#x4E0A;&#x9762;&#x7684;&#x6CE8;&#x518C;&#x6280;&#x672F;&#x6765;&#x6269;&#x5C55;&#x652F;&#x6301;&#x4E0D;&#x540C;&#x7684;&#x538B;&#x7F29;&#x683C;&#x5F0F;&#xFF0C;&#x7136;&#x540E;&#x6839;&#x636E;&#x9700;&#x8981;&#x901A;&#x8FC7;&#x533F;&#x540D;&#x5BFC;&#x5165;&#x9009;&#x62E9;&#x5BFC;&#x5165;&#x8981;&#x652F;&#x6301;&#x7684;&#x538B;&#x7F29;&#x683C;&#x5F0F;&#x7684;&#x9A71;&#x52A8;&#x5305;&#x3002;</p>

                                
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